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* @file AppShell.tsx
* @module app/layout/AppShell
*
* @summary
* Thin orchestrator managing application shell state and layout coordination.
* Delegates rendering to focused sub-components (header, sidebar, main).
*
* @enterprise
* - Single source of truth for theme, locale, and drawer state
* - Coordinates state flow between header, sidebar, and main content
* - Manages localStorage persistence for theme and locale preferences
* - Session timeout enforcement and health check monitoring
* - Clean separation: orchestration vs. rendering logic
*/
import * as React from 'react';
import { useLocation, useNavigate } from 'react-router-dom';
import {
ThemeProvider,
CssBaseline,
Box,
Snackbar,
Alert,
} from '@mui/material';
import { useTranslation } from 'react-i18next';
import { useQueryClient } from '@tanstack/react-query';
import { useSessionTimeout } from '../../features/auth';
import { ToastContext } from '../../context/toast';
import { buildTheme } from '../../theme';
import type { SupportedLocale } from '../../theme';
import { useAuth } from '../../hooks/useAuth';
import { API_BASE } from '../../api/httpClient';
import { AppSettingsDialog } from '../settings';
import AppHeader from './AppHeader';
import AppSidebar from './AppSidebar';
import AppMain from './AppMain';
import { getHelpTopicForRoute } from './navConfig';
/* LocalStorage keys for persistence */
const LS_THEME_KEY = 'themeMode';
const LS_LANGUAGE_KEY = 'i18nextLng';
/**
* Normalize i18n language string to SupportedLocale enum.
*
* Converts language tags like 'de-DE' or 'en-US' to simple 'de' or 'en'.
*
* @param lng - Language string from i18n or localStorage
* @returns Normalized locale ('de' or 'en')
*/
function normalizeLocale(lng?: string): SupportedLocale {
return lng?.startsWith('en') ? 'en' : 'de';
}
/**
* Application shell component.
*
* Manages layout state and renders fixed AppBar, responsive Drawer,
* and main content area. Coordinates:
* - Theme mode (light/dark) with localStorage persistence
* - Locale selection (de/en) with i18n integration
* - Mobile drawer toggle
* - Session timeout monitoring
* - Health status checking
* - Toast notifications
* - Settings dialog
*
* Authenticated pages render inside this shell via <Outlet />.
*
* @returns JSX element rendering the application shell layout
*/
export default function AppShell() {
const { i18n } = useTranslation(['common', 'auth']);
const navigate = useNavigate();
const location = useLocation();
const queryClient = useQueryClient();
const { user, logout } = useAuth();
const isDemo = Boolean(user?.isDemo);
// Get current help topic based on route
const helpTopic = getHelpTopicForRoute(location.pathname);
/**
* Initialize locale from localStorage or i18n default.
* Listens to i18n language changes to keep state in sync.
*/
const initial = normalizeLocale(localStorage.getItem(LS_LANGUAGE_KEY) || i18n.resolvedLanguage || 'de');
const [locale, setLocale] = React.useState<SupportedLocale>(initial);
React.useEffect(() => {
// Sync locale state with i18n language changes
const handler = (lng: string) => setLocale(normalizeLocale(lng));
i18n.on('languageChanged', handler);
return () => {
i18n.off('languageChanged', handler);
};
}, [i18n]);
/**
* Initialize theme mode from localStorage.
* Defaults to 'light' if not previously set.
*/
const [themeMode, setThemeMode] = React.useState<'light' | 'dark'>(() => {
const saved = localStorage.getItem(LS_THEME_KEY) as 'light' | 'dark' | null;
return saved || 'light';
});
/**
* Build MUI theme object based on current locale and theme mode.
* Recreated when either locale or themeMode changes.
*/
const theme = React.useMemo(() => buildTheme(locale, themeMode), [locale, themeMode]);
/**
* Apply a specific theme mode.
* Persists choice to localStorage and shows toast notification when mode changes.
*/
const handleThemeModeChange = (nextMode: 'light' | 'dark') => {
setThemeMode((prev) => {
if (prev === nextMode) {
return prev;
}
localStorage.setItem(LS_THEME_KEY, nextMode);
setToast({
open: true,
msg: nextMode === 'dark' ? 'Dark mode enabled' : 'Light mode enabled',
severity: 'info',
});
return nextMode;
});
};
/**
* Change locale and sync with i18n.
* Persists choice to localStorage and shows toast notification.
*/
const handleLocaleChange = (next: SupportedLocale) => {
localStorage.setItem(LS_LANGUAGE_KEY, next);
setLocale(next);
i18n.changeLanguage(next);
setToast({
open: true,
msg: next === 'de' ? 'Sprache: Deutsch' : 'Language: English',
severity: 'info',
});
};
/**
* Handle logout action.
* Clears client state and then triggers backend logout (for real users)
* or a simple client-side redirect (for demo users).
*/
const handleLogout = () => {
console.debug('[AppShell] handleLogout invoked at', location.pathname, {
hasUser: Boolean(user),
});
// Demo mode: clear client state and route directly to logout-success
if (isDemo) {
queryClient.clear();
logout();
console.debug('[AppShell] demo logout → redirecting to /logout-success');
navigate('/logout-success', { replace: true });
return;
}
// Real user: trigger backend logout via POST redirect, avoid SPA guard flicker
const form = document.createElement('form');
form.method = 'POST';
const returnUrl = `${window.location.origin}/logout-success`;
form.action = `${API_BASE}/logout?return=${encodeURIComponent(returnUrl)}`;
form.style.display = 'none';
document.body.appendChild(form);
console.debug('[AppShell] submitting logout form to', form.action);
form.submit();
};
/**
* Session timeout/ping configuration.
* Monitors idle time and pings backend to maintain session.
*/
useSessionTimeout({
pingEndpoint: '/api/me',
pingIntervalMs: 60_000,
enableIdleTimeout: false,
idleTimeoutMs: 15 * 60_000,
});
// Drawer and dialog state
const [mobileOpen, setMobileOpen] = React.useState(false);
const [settingsOpen, setSettingsOpen] = React.useState(false);
// Toast notification state
const [toast, setToast] = React.useState<{
open: boolean;
msg: string;
severity: 'success' | 'info' | 'warning' | 'error';
} | null>(null);
return (
<ThemeProvider theme={theme}>
<CssBaseline />
<ToastContext.Provider
value={(msg: string, severity: 'success' | 'info' | 'warning' | 'error' = 'success') => setToast({ open: true, msg, severity })}
>
{/* Application Header (fixed) */}
<AppHeader
themeMode={themeMode}
onThemeModeChange={handleThemeModeChange}
locale={locale}
onLocaleChange={handleLocaleChange}
onLogout={handleLogout}
helpTopic={helpTopic}
isDemo={isDemo}
onDrawerToggle={() => setMobileOpen((v) => !v)}
/>
{/* Main container with sidebar + content */}
<Box
sx={{
display: 'flex',
flex: 1,
minHeight: 0,
bgcolor: 'background.default',
}}
>
{/* Sidebar Navigation */}
<AppSidebar
mobileOpen={mobileOpen}
onMobileClose={() => setMobileOpen(false)}
themeMode={themeMode}
onThemeModeChange={handleThemeModeChange}
locale={locale}
onLocaleChange={handleLocaleChange}
onLogout={handleLogout}
onSettingsOpen={() => setSettingsOpen(true)}
user={user || undefined}
/>
{/* Main Content Area */}
<AppMain isDemo={isDemo} />
</Box>
{/* Toast Notifications */}
<Snackbar
open={!!toast?.open}
onClose={() => setToast((t) => (t ? { ...t, open: false } : t))}
autoHideDuration={2500}
anchorOrigin={{ vertical: 'bottom', horizontal: 'right' }}
>
<Alert severity={toast?.severity || 'success'} elevation={1} variant="filled">
{toast?.msg}
</Alert>
</Snackbar>
{/* Settings Dialog */}
<AppSettingsDialog open={settingsOpen} onClose={() => setSettingsOpen(false)} />
</ToastContext.Provider>
</ThemeProvider>
);
}
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